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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcf8d04749579b4ad586f7fa647d2d0e9ce85cb48dac45263eabdacbbcd7a40d' 
  AND token = 'd7Gi6IUzsRLfwXO9FZQ0SUM23TDqw1F+UpSMg9624j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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