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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bf9c3787b54a64c8d5f8b9957487a726c15826e5953fe3772a33fe533e5f779' 
  AND token = 'T8zzib0ebj5mNVAGYavkA/Xx2R2tK5AdgeMT9fy7bB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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