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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c52257c6e72e3e0e7a4c137970be8649fd724b5f0e40f6e4671bf025be4ccf39' 
  AND token = 'j3KLaikd+KP4Zkkm6kSvbLk5o9l2eP2H1EDk1Cpea8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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