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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eaee0c2d3c96c2097a65a29b3eabf7efc1b0ce7b509cf3fcd83b5cdbb57ce71' 
  AND token = 'MkdKcyAuTIxiHMgN/71hHGxDf3OuuHiMHpKEGC3Tr6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}