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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0396b9be6be8c2f2b9ec85bf8f39d8eba9bfb9d993e40bb261f9cae17504cee' 
  AND token = 'jkJ/G4zJDp2peTefSzYNf3p/7moFV/G3VQxV7rdZyXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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