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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38a5d547a09a34f68d628cc56efd7e82df6706f13239fb8d74a845ab79d0b7d4' 
  AND token = 'JweQfh7rCdzOORlYoOI9BHkOr1WosytlaWZV41V3G7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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