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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a15618dcc0f5e47b26fdbce49c147dc4ecad5acdf56fcd2018467dba1a84af01' 
  AND token = '+dwJup/7W60GkWK/BNiSGnaa54rAbT6alhOGIA+dC7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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