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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '060e4c8475a35567f3d32519bcaead0a003aa300ada3864c02736146ba011bf6' 
  AND token = 'Jo4Me04gHyEPTCad95yGy5aXHniG3avvGQnAmRSuC6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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