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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d8eac2a003f6f82392e349dfd98b5967de9b3e044fdbde83077a7a814018e4a' 
  AND token = 'tzlM3AXJ4y+3G6TP0ZFrJSGhd5dy7l81MY8/rnWKmbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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