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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '714d42b8abada12258f4fefc2b8192081df457b5ba390dc7bfa902805cde3f9c' 
  AND token = '1k7PT6eAiPetQ8oTHt5BcZclXbkbqvoJmvhEQCfgWOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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