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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04ef51fea3380ec1d239bf9995ebabc23ad84626431eb0c1f003916aae642f7e' 
  AND token = 'PeGpQE29V+bSpOrYKJ7wnl38dQeXmoTay7Ow95kYdJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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