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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9b0ebfb27ad77e7f85a33b428bf3a3dcd39d1aa640298b0467583a19704a189' 
  AND token = '7sve3bETbJnUuL4LCmy3Nw+dwUNoYYFZhUDx/yue4co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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