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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a510035537d6de49d73868dea19014f4dbb02ae23c10f9ff05b1250a2070765' 
  AND token = 'WleSR2r6fax7AHiuB/YUQQfopZ1aptKV8BYdw5NoiX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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