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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3c732838de6dc674df2dcf652b33b18e188cb6bdf15af9efce8f1ef35d63abd' 
  AND token = 'xezFRO2877H+8mNdG2xEfFh0GSxFh2SrmY5UyY4NOzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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