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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90cbd63de2f85138e03102a488dc5e065cf0c6336f5c462396a578d269629e55' 
  AND token = 'MByZ+q1aZSQc2mN20bKWWid+KnTIOZDJGXa/dbiXsmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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