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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e4ffc6842f82f1bdf4545c45d27ffb0e5affdbaa6978f05c16f655b9f0e4edc' 
  AND token = 'FCEb4jW87eIsN74DP3hfeyEsghhV7tz3BLSRrTSC9pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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