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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac254dc9b9a5b05f4baea7c58ea6ee4afac54e6cbc1bb171864b1ba8be13a0e0' 
  AND token = 'S+LJHoJ/VX6hDCro3C6RBLmZZFJi1GGNTEsYEXe8TLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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