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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b7f7d2c1abb89c472d02c33227b13ae554a4b8a27704ccbee8f2e3598034a00' 
  AND token = 'Ro3ctIJZFqpPuShRO9gAmF9At+Qe5PSQUN9HaCDYHrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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