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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afdbb6428e6f2f83facd47283b19db54b14e33a3f8a65705811f657da39cca61' 
  AND token = 'sxjqk6/WZssH2Nrl79Bow0a5DW3KEOjWs2MWTRKnHKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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