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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '049567debc94f4901aa8ae593b8e2c85a609c96965de02e7458b0a261ea58080' 
  AND token = 'oGhi1XsLfF7v8whkv4mNT1wZ1kYypuWKrBX7jxKobSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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