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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47649375f23b71144e517f5529bbd9b615dc203cc098c929c5dfe1de7019c6f7' 
  AND token = 'I6UkCrTBcfcSnqEGR+0WokxJTwdwqRTgs8oyTY2mrsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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