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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '384de484ad52c94f6ca8400d2c936d8117ab0fda4ef550b1f65ea1a456eeb16e' 
  AND token = 'rU6c2J0ua8S6M5jqZfjoSLUH1/R+5gmrgEhoMREFthk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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