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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a9e244a7e59cf99a0d875d7f851b3b3e6dfc7f2657bb6966b4adb35fba59ad3' 
  AND token = '2RNk24bEA37vsp5rtD4W/Tk9ZtblBtWYn77EU6/1e40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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