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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bcfff5809d4ba3e672e347e7d29325e1112449c5de66fc7feeb6dd6aadcbd8d' 
  AND token = '0306/IGcrXPHHoaWbf75wtOZUSG3P7Hp5yeG+LAoxTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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