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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5463de93e6a97ebc7446697cbd9091d569ac92a57e937ea5950eb2b078ff1166' 
  AND token = '9ue/w/1lJALFc1Dj9Sx+32Tb7EQ77e7+6U4b9WYXKtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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