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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eab889751e2a21da14da7c6f8ad121c2fa23fba98510431d6352acec7a48139d' 
  AND token = 'KQ1Ua4et5HbdapWJgHvebc70ZWgBwKMt5Ek2mz9sZUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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