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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50de84bc84bf5f1e431eff3216e1a431787b3b51d2597600e09f6ce33b8b6e8d' 
  AND token = 'KKcLVYMZIv06fHRoSxrgEf2gqrT714tvLsGEVRJOLf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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