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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b09129dab1844f813076344baf301eb12e1f168da3ca48e0dbcafb5c139b0119' 
  AND token = 'MVenHJQsj66IaaNIEsYMEYrS+w2et7C9ENahHZP3wVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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