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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdd42b63b68de167306a02102f6a7244ac49b8aba57247ee6bccbeed9ecf08a6' 
  AND token = 'lTSbOoCGDKSrWsHUARFAJq2bMh9j4yELJcmz8Pmi31A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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