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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6082b02ee2d75ecc879fa9b4874d0e9987caf3c4b5d2f8a6bc22a792c69a6d4f' 
  AND token = 'pTb5ZEeSpAG6l6lm1Myi4JcuOoRWv7ooqNMUtFVE1vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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