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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a51e259c07411baf7fd40d10b72b84e56c6d771ec4fecb24d07bcba34bc93f98' 
  AND token = 'Sr6HQdT5eqWuAAw97/LfvoRCokzsMUAOc4cv7Gmk4w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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