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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e0d11aa558945d8b61287c8d3385d818ac16b09062358c9cf5897a5c524d3c9' 
  AND token = '54yPEmgLmRESA47MQ6G9pag2svCgaD/Gwzm90jf1Qro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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