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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a05b98c25dc51cd4e0d9a5f02bf8e419a242bb2a850ad5fabd4002bf1aa3a914' 
  AND token = '+p9VQp+AMdWGRlfXj6UCN7RdtRE57ewW86s6kp0YNus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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