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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0595c51cae46f113122f645f0e86662157e8bb9c65730ebcf05441e91a865ab' 
  AND token = 'M4sTkZ+c3btI2Dg2oAUUxNOkmfzjEcfc/ZKCW1jgqXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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