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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f42e58491d6b34f36a6d796ed2d5849556b9544e736624c77118a640e19e73f2' 
  AND token = '6bXNXkgTamVlYKgOrEfrk6upSclKInijzWarPov4bOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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