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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '709b90a1f7560e3390841cd6857766764df926c0d8e67a4018e70a12b55172a0' 
  AND token = 'B/xQEKRgj73QWdNbl+FTNoc8zL9Eomp8b2hQJ7OcApk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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