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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c5febc7ebdb058aa138169affe7e05c38b8bb3eba0d375e5dd3c72e78f08312' 
  AND token = '2NdLJ+PfJKr0Vxp5u8b3CNq4dc2WlSZ58C/SXwd+NPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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