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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27fd92ee61536f769e1021b2b6da4e8cbac3e5669b545741a3d13e432f426711' 
  AND token = 'shrXSRNpFJKTCCy3kYxUhqafP9U1fAnXx8WzujNtyOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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