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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec727c4fb09f276c6a9a41bf45e955115bc6a84b7d21fe08d1baaeef9c757f67' 
  AND token = '+ccGHHyFF4jDu79JD4w4nR2cLKj4XOGq1MI5y+8rkBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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