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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78467d559ee376c62dbed49a7a9728291f6db92c5851e45f11bb67ca7546c541' 
  AND token = '38GyLGXOk796daQZxzA1DyWuJM0L/PJpK1hBLXYbeiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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