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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '762f841fa942232d8bd812a96fac8dd59d20c9c1b512fb93a420efb1642b45f6' 
  AND token = 'crKYJ8wV8Q5DMbrn+Kbk2NAFk23KNyoyxqRxCVNB4iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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