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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f7efdaf49ee4dbcdaf8d38b0bcbcb77f903c774680e4b343d3f25593047e535' 
  AND token = 'e1tS3HLiUme60bkMKVtNT6e0iSX7oS2boCJ9Pha+8As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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