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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a5b3f49f814b3056d8f2e0858f3b9b3cf70190a153817f399c067ae4144b64d' 
  AND token = 'iIj1ZCQgsprK0sjkYJr9R4ndG3DcChoCjER8rYYCCN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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