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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a199c514b5c5906d08d1d804d16195b74bdc58d5aa8b7658ae6257f98ea8f12' 
  AND token = '0Cj9twVW/pPmoXSB8go8cGI4t5TU3bzTbbkw6NS6jqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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