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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce5938e798eedf88ff9e37ee624d4dd9b90fd6aaf7f7510aa7a82e8422d672b0' 
  AND token = '3Fm13atqcX3T7qDqzZimx6wKpit8KXPmzvGvko4WTMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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