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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5381053fe3120751be827ced9547bad5931fd2b682be3911cd69deca407a690f' 
  AND token = 'NDirEl0aOPFWlnusVJJlwcm4Zk0Hvwb67HcCJS0jx78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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