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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6af6267236cfdfadfb7848579312feb4d46615c79648ba4e25c3ad52ee416d6' 
  AND token = 'R4xX2wOcw5jk0QgU7H+uCgFm73CzjO2thKPcwAdu4M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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