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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00bfd542a2f83ebdfebd58fe1dca14effe6647877f47b1fad819a1a81fbfda84' 
  AND token = 'Uo3cYfMgbgmn5tBCmHr9PFJLR03EKTaD/wyEBSyS0TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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