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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '863dd4b0e37d0dfca9cb71a005b8ddb5211fa9e7c675c09e4ef5651dbaf47251' 
  AND token = 'TRmZ3UtRDDUuWgzw0ws972C5gDoc4EsQIb+yAlgQmIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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