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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91b7a03cbc6ad77ce9f0d02e5b9c754ebda40e5f9e0f146a72906fca3e89fed5' 
  AND token = 'coRBa+FunBXEZBn2G2x83JM2U4VmXelPrtmCrSObWII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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