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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25794228508b51cfd0ec6487cdbcb1c5c6a48c17b61d03718e2be92f9b14e8a0' 
  AND token = 'ik7A+Qa/Gi74zl5CvBNsoNgNdjkcmyIhPWxHfStcjRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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