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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87779e4942b9693f1fb6e3feb1f43cecaee6b10faf6a610ff67baaf1e9009cb2' 
  AND token = 'S9+l10QTIFwXxAJYyA2B1bk5M3gKkoSUon5/VVfn+00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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