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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b99102f23bd1c14daa45a57e742c1c92eed1a73d6d121b90afb15dc60a0d84ee' 
  AND token = '3tCtyFHsFwMIBDmNPE4bK/tdsEFltd08y9cUoSQ70T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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