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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c213018a6f4b8a3e13e4839ac22fedcab1c0d4c6b87981acf79ebbdc08f38ef3' 
  AND token = 'aF/t+A3VooNIh8yg99I2Z3H3HriRh++ZUpR1/WYfOnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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