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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d37c7696c06c77f30f262a331ddb29b42d3c7585c408f12322920091a68330c' 
  AND token = '50Od7irlfRwH9Od2cAEzMeklJMgPpfVBLsU5KIkAs7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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