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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '119f0f1116772cee39815a33c22dce995867845c2d1ea3d46a727196c02cab27' 
  AND token = 'oiJNhTr62g7kzLZkJ1jR4CTNOwtj4X8wuf9ZKylYOoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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