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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7eaf59ec23dcf6c7d4bc159a7d15be6688cb03ae7bcc80e9c031e6d5efbc6549' 
  AND token = '0O5gdMvrILgM8ahEkHsqHeCx/m2iRNUS7HbWJhoQEsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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